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Share-Based Compensation Changes in nonvested shares (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | A summary of changes in the common shares subject to nonvested PBRSUs for the years ended December 31, 2017 and 2016 follows:
| Common shares subject to PBRSUs
Nonvested at January 1, 2016 | 44,700 |
Granted | 41,550 |
Vested | — |
Forfeited | (825 | )
Nonvested at January 1, 2017 | 85,425 |
Granted | 45,788 |
Vested | (9,674 | )
Forfeited | (3,021 | )
Adjustment for performance conditions of PBRSUs (1) | (1,802 | )
Nonvested at December 31, 2017 (2) | 116,716 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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